how to lower soil ph?

I have 3 different strains at 4 weeks in veg, i took a soil sample and put it in a cup of tap water ( my tap is about 7.2) and let it sit and then got a reading of 7.1. so obviously my tap is a little too high. Its hard to get an accurate reading of soil ph but i beleive its a little higher than it needs to be and im getting nutrient lock. My plants are looking a little stressed. So what do i need and in what is the recipe and how do i administer it to the plants. Can i just put dolomite lime on top of the soil? i dont want to lower it more than 6.5

Depends on the pH. My tap water is around 7.6, and I use about two teaspons to a tablespoon, depending on whether I'm adding nutes or not.

Just use the pH tester and gradually add.

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ok so, if i start PHing my nute solution and water to say 6.5 the soil should eventually even out and come down a little bit so i may not even need to adjust the actual soil itself? I have ph up and down for that. I think i was confused because what some people do is adjust the soil itself, or they adjust the nutrient or water they give the plants to correct the ph issue in the soil, im not sure which i should be doing at this point. I dont know if that makes sense to you..

ok so, if i start PHing my nute solution and water to say 6.5 the soil should eventually even out and come down a little bit so i may not even need to adjust the actual soil itself? I have ph up and down for that. I think i was confused because what some people do is adjust the soil itself, or they adjust the nutrient or water they give the plants to correct the ph issue in the soil, im not sure which i should be doing at this point. I dont know if that makes sense to you..

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soil PH is what it is for the most part. try using a larger soil:water ratio to test or use a balamced solution (water) which 7 is nuetral anyways and 6.8 is ideal for soil so if your at 7.1 your really not that bad off man.......

I'd go with the distilled vinegar personally out of those two methods. The best possible method you can use though is aluminum or ammonium sulfate, or any type of sulfer fertilizer, although they are a bit harder to find.